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Teaching tip More information on ISDN can be found on webopedia.com/TERM/I/ISDN.html.
Teaching tip For more information on dsl see www.dslreports.com.
Insider information A socket (UNIX or Windows) is a combination of an IP address and a port. For example, connecting to the HTTPS port on machine 192.168.110.15. The socket is 192.168.110.15:443.
Teaching tip Figure 10A.4 on page 387 describes this interaction very well.
Teaching tip Grok Technologies of Pittsburgh PA provides a good example of WWAN plans. Visit www.groktechnologies.com for more information.
Teaching tip Satellite services are not inexpensive. Www.groundcontrol.com is one site offering satellite Internet services.